Device for activity test of extraction check valve

Abstract

The device includes a main valve, first and second auxiliary valves, a valve body and a filter. The main, which has first and second auxiliary valves are mounted on the valve body, which has an air inlet, a cylinder port and an air discharging port. The air inlet is in communication with the main valve through a first air passage, the cylinder port is sequentially in communication with the first and second auxiliary valves, and the main valve through a second air passage. The air discharging port is sequentially in communication with the first and second auxiliary valves and the main valve through a third air passage. The main and the second auxiliary valves are solenoid valves, and the first auxiliary valve is a hand-operated valve. An air outlet of the filter is in communication with the air inlet. The filter is used for filtering out impurities in gas.

What is claimed is: 
     
       1. A device for an activity test of an extraction check valve, comprising:
 a main valve; 
 a first auxiliary valve; 
 a second auxiliary valve; 
 a valve body; and 
 a filter; 
 wherein the main valve, the first auxiliary valve and the second auxiliary valve are mounted on the valve body, and the valve body is provided with an air inlet, a cylinder port and an air discharging port, the air inlet is in communication with the main valve through a first air passage, the cylinder port is sequentially in communication with the second auxiliary valve, the first auxiliary valve and the main valve through a second air passage, and the air discharging port is sequentially in communication with the second auxiliary valve, the first auxiliary valve and the main valve through a third air passage; the main valve and the second auxiliary valve are solenoid valves, and the first auxiliary valve is a hand-operated valve; an air outlet of the filter is in communication with the air inlet, and the filter is used for filtering out impurities in gas. 
 
     
     
       2. The device for the activity test of the extraction check valve according to  claim 1 , further comprising a filtering pressure-reducing valve and a needle valve, wherein the needle valve, the filtering pressure-reducing valve, the filter and the air inlet are sequentially in communication with each other. 
     
     
       3. The device for the activity test dcvicc of the extraction check valve according to  claim 1 , further comprising a movable bracket, wherein the movable bracket is connected to a ground through a foundation bolt, and the valve body is fixed on the movable bracket. 
     
     
       4. The device for the activity test of the extraction check valve according to  claim 1 , wherein the main valve comprises a main valve sleeve, a main valve core and a first drive coil; the first drive coil is disposed on one side of the valve body, the first drive coil is used for driving the main valve core to move, the main valve sleeve is disposed inside the valve body, and the main valve core is disposed inside the main valve sleeve; the first air passage, the second air passage and the third air passage are in communication with the main valve sleeve, two first shoulders are disposed on an outer surface of the main valve core in an axial direction of the main valve core, and an outer surface of each of the first shoulders is attached to an inner surface of the main valve sleeve. 
     
     
       5. The device for the activity test dcvicc of the extraction check valve according to  claim 4 , wherein a first spring is disposed between an inner bottom end of the main valve sleeve and the main valve core. 
     
     
       6. The device for the activity test of the extraction check valve according to  claim 1 , wherein the first auxiliary valve comprises a first auxiliary valve sleeve and a first auxiliary valve core, the first auxiliary valve sleeve is disposed inside the valve body, one end of the first auxiliary valve core extends into the auxiliary valve sleeve, the first auxiliary valve sleeve is in communication with the second air passage and the third air passage, two second shoulders are disposed on an outer surface of the first auxiliary valve core in an axial direction of the first auxiliary valve core, and an outer surface of each of the second shoulders is attached to an inner surface of the first auxiliary valve sleeve. 
     
     
       7. The device for the activity test of the extraction check valve according to  claim 6 , wherein one side of the valve body is provided with a limiting cavity, the other end of the first auxiliary valve core is connected to a manual push rod, the manual push rod passes through the limiting cavity and extends out, a limiting block is circumferentially disposed on an outer surface of the manual push rod, and the limiting block is clamped in the limiting cavity; the first auxiliary valve further comprises a second spring and a third spring, wherein the second spring is disposed between an inner bottom end of the first auxiliary valve sleeve and the first auxiliary valve core, the manual push rod is sleeved with the third spring, and the third spring is disposed between an inner bottom end of the limiting cavity and the limiting block. 
     
     
       8. The device for the activity test of the extraction check valve according to  claim 1 , wherein the second auxiliary valve comprises a second auxiliary valve sleeve, a second auxiliary valve core and a second drive coil, wherein the second drive coil is disposed on one side of the valve body, the second drive coil is used for driving the second auxiliary valve core to move, the second auxiliary valve sleeve is disposed inside the valve body, the second auxiliary valve core is disposed inside the second auxiliary valve sleeve, the second auxiliary valve sleeve is in communication with the second air passage and the third air passage; two third shoulders are disposed on an outer surface of the second auxiliary valve core in an axial direction of the second auxiliary valve core, and an outer surface of each of the third shoulders is attached to an inner surface of the second auxiliary valve sleeve. 
     
     
       9. The device for the activity test of the extraction check valve according to  claim 8 , wherein the second auxiliary valve comprises a fourth spring, and the fourth spring is disposed between an inner bottom end of the second auxiliary valve sleeve and the second auxiliary valve core.